Mitsumi Electric Company Ltd.

Toshinori Kurosaka

Yoshimi Hanaika

Shigenori Inamoto

Hisateru Komatsu

Tsuneo Uwabo

Makoto Konno

Hisashi Shibata

Atsushi Kirii

Tamotsu Shibata

In a disk apparatus for driving a recording disk medium, a spindle motor is provided with a rotary shaft. A chucking table, on which the recording disk medium is mounted, includes a support integrally formed with a support base having a supporting face which supports the recording disk medium, a cylindrical bearing part, into which the rotary shaft is fitted, extending from the support base in parallel with the rotary shaft, and an annular abutment part extended from the support base in parallel with the bearing part, to be abutted against an inner periphery of the recording disk medium. The chucking table includes at least one claw member provided in an outer periphery of the abutment part, and an urging member disposed between the claw member and the bearing part so as to retractably urge the claw member outwards in a radial direction of the recording disk medium.

Disk apparatus

A floppy disk cartridge includes an upper shell and a lower shell , a magnetic disk rotatably incorporated between the upper shell and the lower shell , head windows provided at respective one sides of the upper shell and the lower shell so as to face with each other, and liners respectively attached to inner faces of the upper shell and the lower shell except the head windows for protecting the magnetic disk , characterized in that at the inner face of either one of the upper shell and the lower shell are formed concave portions along both left and right side edges of the head window , and that the liner is attached to the inner face of the upper shell or the lower shell from respective outer edges of the concave portions

Floppy disk cartridge with concave portions formed in an upper or lower shell

A disk table in a magnetic disk drive is disclosed. The disk table comprises a disk table body having an opening, a chucking arm made of an elastic body, where one end of the chucking arm is fixed on a lower face of the disk table body and the other end of the chucking arm is set free, a chucking roller disposed on the other fee end of the chucking arm, where the chucking roller is protruded from an upper face of the disk table through the opening, and a stopper provided on the lower face of the disk table in the vicinity of the free end of the chucking arm, wherein the chucking arm is freely floatable in vertical direction, and the amount of separation of the free end of the chucking arm from the lower face of the disk table body is restricted by stopper when the chucking roller is urged downwards. The restricted amount of displacement of the free end of the chucking arm is set such that the chucking arm would not deform plastically, or such that the chucking roller would not slip off or remove from said opening of the disk table body.

Disk table in magnetic disk drive

A stator of a direct drive motor is disclosed. The stator comprises a supporting member which supports a central portion of the stator, a first core including a mounting section and a magnetic pole section, a fixing member fixing the first core onto the supporting member through the mounting section of the first core, and a second core mounted on an upper surface of the first core, the second core including a magnetic pole section and a hole section disposed on the mounting section of the first core, wherein an upper end of the fixing member is lower than an upper face of the second core.

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Yamagata, Japan

Toshinori Kurosaka